Writing instrument



FIG. 1 is a perspective view of a first embodiment of a writing instrument embodying my new design;

FIG. 2 is an elevational view of the writing instrument of FIG. 1;

FIG. 3 is an elevational view showing the writing instrument of FIG. 1 in another position;

FIG. 4 is an elevational view showing the writing instrument of FIG. 1 in another position;

FIG. 5 is a perspective view showing a second embodiment of a writing instrument embodying my new design;

FIG. 6 is an elevational view showing the writing instrument of FIG. 5 in another position;

FIG. 7 is an elevational view of a third embodiment of a writing instrument embodying my new design; and,

FIG. 8 is an elevational view of a fourth embodiment of a writing instrument embodying my new design.

The dashed lines are for illustrative purposes only and form no part of the claimed design. 

The ornamental design for a “writing instrument,” as shown and described. 